We speak HVAC so you don't have to
CONNECT with us!

our tools and detailed reports
can help you choose the best
furnace, boiler, heat pump or
central air conditioner.

Find Local Contractors

1. I need a new:

2. My zip code is:

Williamson-Thermaflo Boilers

Updated: Jul 27, 2015
By Gary Sprague
Read Williamson Thermaflo Furnace Reviews
Write a review of Williamson-Thermoflo

Williamson-Thermoflo Co. offers a full line of oil and gas furnaces, oil and gas boilers, indirect-fired water heaters, and air conditioning products. Williamson-Thermoflo is an independent business unit of Weil-McLain, which is a subsidiary of SPX Corp. SPX's Thermal Equipment and Services division, of which Weil-McLain is a part, posted revenues of $1.3 billion in 2014.

Corporate History

Williamson was established in 1890 and Thermoflo was founded in 1946. They partnered in 1999 to become Williamson-Thermoflo and were acquired by Weil-McLain the same year. SPX was founded in Muskegon, Mich., in 1911 as The Piston Ring Co. and acquired Weil-McLain in 2001.

Despite the 1999 partnership of the two manufacturers, the company today sells its furnaces, boilers and air conditioners under two brands: Williamson and Thermoflo. The company promotes the former brand for its easy-to-service design and durable performance, while noting the latter brand's value and range of heating capacities.

Product Lines

 [ Williamson-Thermoflo Series : Temp-O-Matic ]

The Williamson-Thermoflo range of boilers includes a wall-mounted gas-fired condensing unit and an oil-fired water boiler with tankless heater. The company also manufactures both an oil-fired and a gas-fired steam boiler. The company's boilers are constructed of cast iron and are available in models with up to 91 percent AFUE except for the wall-mounted stainless steel Freestyle unit, which has an AFUE of above 92 percent.

Williamson-Thermoflo furnaces are available in models with up to 90 percent AFUE, in single- or variable-speed, and for any number of installation profiles.



How to find an HVAC Contractor

FurnaceCompare's free Find a Contractor tool can help you find qualified pre-screened contractors. Every contractor in our database has been screened for a clean credit and legal history, and has been in business for at least three years.

Contacting Williamson-Thermoflo

8201 West Calumet Road
Milwaukee, WI 53223

Phone: (800) 736-2378


Williamson-Thermoflo boilers come with a limited lifetime warranty. There is a lifetime warranty against leaking. Williamson-Thermoflo products are serviced through professional heating contractors.

Copyright 2002 - 2016 furnacecompare.com